Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 48, NWS Houston/Galveston, TX

May 11, 1999Grimes County, Texas

NWS Houston/Galveston, TX issued this tornado warning at May 11, 1999, 11:40 PM CDT for Grimes County, Texas. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 11, 1999, 11:40 PM CDT (04:40 UTC)
Expired
May 12, 1999, 12:15 AM CDT
In force
35 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Grimes County, TX

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 11, 8:30 PM CDTTornado WatchSPC4 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 4.7 hours before the alert went out and 283 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 1999-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2666 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 1999-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2666 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
881 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 10:23 PM CDTSevere Thunderstorm WarningHGXBurleson67 min
May 11, 10:50 PM CDTSevere Thunderstorm WarningHGXBrazos40 min
May 11, 11:25 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson35 min
May 11, 11:49 PM CDTSevere Thunderstorm WarningHGXGrimes, Walker41 min
May 12, 1:25 AM CDTSevere Thunderstorm WarningHGXHarris, Liberty, Montgomery50 min
May 12, 6:06 AM CDTSevere Thunderstorm WarningHGXSan Jacinto39 min
May 12, 6:47 AM CDTSevere Thunderstorm WarningHGXSan Jacinto43 min
May 12, 7:17 AM CDTSevere Thunderstorm WarningHGXAustin58 min
May 12, 7:20 AM CDTSevere Thunderstorm WarningHGXLiberty40 min
May 12, 7:51 AM CDTFlash Flood WarningHGXSan Jacinto119 min
May 12, 8:10 AM CDTSevere Thunderstorm WarningHGXMontgomery, Waller45 min
May 12, 8:28 AM CDTSevere Thunderstorm WarningHGXHarris62 min
May 12, 10:08 AM CDTSevere Thunderstorm WarningHGXHarris57 min
May 12, 11:19 AM CDTSevere Thunderstorm WarningHGXGalveston61 min
May 12, 12:01 PM CDTSevere Thunderstorm WarningHGXChambers44 min

Nearby

Tornado Warnings in Texas, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.